CVE-2026-78410

Name	CVE-2026-78410
Description	A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
util-linux (PTS)	bookworm	2.38.1-5+deb12u3	vulnerable
	bookworm (security)	2.38.1-5+deb12u1	vulnerable
	trixie (security), trixie	2.41.5-0+deb13u1	vulnerable
	forky	2.42.2-4	vulnerable
	sid	2.42.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
util-linux	source	(unstable)	2.42.3-1

[trixie] - util-linux <no-dsa> (Minor issue)
https://github.com/util-linux/util-linux/security/advisories/GHSA-rh77-686x-2f2m